Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
cho hoc » co hoc, khoa hoc
cao hoc » co hoc, chat hoc
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
sach ky » sac ky, sach y, sach ty
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
hanh ve » hanh vi, hanh va, hanh kem
ve cau » ke cau, va cau, ve cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((cao hoc) or (cho hoc)). hieu va chat ((truc va) OR (thuc va)) hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((cao hoc) OR (cho hoc)). hieu va chat ((truc va) OR (thuc va)) hanh ve cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((cao hoc) or (cho hoc)). hieu va chat ((truc va) OR (thuc va)) hanh ve cau tren*".